Lock



Jan. 15, 1929. 1,698,761

J. w. MARSDEN LOCK Filed Sept. 19, 192'? 45 J mMdPSdfiIL 3mm Patented Jan. 15, 1929.

UNITED STATES JAMES WILLIAM MARSDEN, OF SAN FRANCISCO, CALIFORNIA.

LOCK.

Application filed September 19, 1927.

This invention relates to locks and more particularly to a combined key hole guard and bolt whereby, after a key has once been inserted into the lock, a guard, provided for that purpose, can be shifted into engagement with the key to hold it against rotation, to practically close the'key hole, and to shift a bolt into engagement with the knob spindle of the lock, thereby to hold said spindle against rotation.

A further object is to provide a structure of this character carried by the face plate of the lock so that the same can be appliec readily to a lock already in use and without the necessity of mortising or reccssing the door in order to accommodate the face plate.

A further object is to provide a simple and cfiicient device of this character which serves to hold the key against displacement from the lock and can be utilized as a latch for fastening the knob spindle against rotation whether or not the key is used in the lock.

A further object is to provide a device of this character particularly adapted for use in hotel rooms and in other places where the occupant wishes to insure against intrusions.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings, the preferred form of the invention has been shown.

In said drawings,

Figure 1 is a front elevation of the face plate constituting the present invention, the knob spindle and the key beingshown in section, said key and spindle being illustrated as locked against rotation.

Figure 2 is a similar view of a portion of the face plate showing the spindle locked against rotation but the key released for insertion or withdrawal.

Figure 3 is a section on line 33, Figure 1.

Referring to the figures by characters of reference 1 designates the face plate which is preferably stamped out of sheet metal so as to provide a recess 2 in the back thereof of sufficient depth to receive the latch portion of the present invention. The door knob has been indicated at 3 and is connected in the Serial No. 220,504.

usual manner to a spindle 4 of the lock, this spindle being provided with a diametrical bore 5 adapted to be placed therein at a point where it will be positioned within the recess 2 as shown, for example, in Figure 3. This bore can be formed in the spindle of a lock that has already been installed ora spindle of special construction provided with a bore can be substituted for the usual lock spindle.

Eiveted, brazed or otherwise attached to the inner face of the plate 1 is a guide block 6 in which a bolt 7 is mounted to slide, this block serving to direct the bolt into and out of the bore 5. One end of the bolt is attached to a block 8 slidably mounted on the inner face of the plate 1 and connected by a screw, rivet or the like 9 to a key hole guard 10 arranged on the outer surface of the plate 1. This guard is mounted to swing loosely 'on the connecting-bolt or rivet 9 which extends through a short slot 11 formed in the plate 1. The guard 10 is in the form of a metal strip the free end portion of which is outturned as at 12 to provide a finger piece. A recess 13 is formed in one side of this plate 10 and is designed to receive a lug 14 extending outwardly from the plate 1 close to one side of the key hole 15 in the plate. Guard plate 10 has a slot 16 extending thereinto from one side and thisslot has an angular extension 17 adjacent its inner end projecting toward the free end of the plate 10. The width of this extension is substantially equal'to the thickness of the annular portion 18 of the shank of a key 19. It is to he understood that the plate 1 to be secured to the inside of a door where it cannot be reached by any one except the occupant of the room. Key 19 is inserted into key hole 15 and turned so as to throw the bolt of the lock. Thereafter the guard plate 10 is swung laterally from the position shown in Figure 2 so as to cause the angular portion 18 of the shank of the key to be received within the inlet portion of the slot 16 while the upper wall of recess 13 will. lap the front face of the lug 14. Plate 10 is then thrust longitudinally toward the spindle 4 so that the extension 17 in plate 10 will receive the angular port-ion 18 of the shank of the key. This movement will also be sufiicient to allow the upper wall of recess 13 to swing or snap toward the plate 1 into position on the top of lug 14 so that the plate 10 will thus be held in shifted position as shown in F igure 1. Obviously when thus located the plate will hold the key against rotation.

The longitudinal shifting of the plate 10 will cause motion to be transmitted therefrom to the pivotal connection 9 to the block 8 and thence to the bolt 7 which will be thrust into the bore 5. Consequently the spindle l of the knob will be held against rotation. lVith the parts thus arranged the key cannot be turned by any one located'outside of the door and the key hole will be closed. Furthermore the spindle l cannot be rotated. lhus there is no danger of the lock being operated except by occupant ot the room. Plate 10 not only serves to hold the key against rotation but also prevents it from being pushed out of the key hole, Even though the key should not be inserted into the lock the plate 10 could be shifted to move the bolt 7 into the bore 5 and lock spindle l against rotation.

The device described isvery cheap to manufacture and obviously can be applied readily to locks already in All of the mechanism between the plate 1 and the door is located within the recess 2 so that it is not necessary to mortise the door in order to receive any oft-he parts of the attachn'ien't.

What is claimed is: v

1. The combination with a face plate for door locks and the like, having a key hole, of the guard plate pivotally and slidably mounted on the plate shiftable transversely into 'ancl'out of position across the key hole, said plate having a slot for receiving the shank of a key, a bolt slidable with the guard plate for engaging the spindle of a knob, said plate being slidable to embrace the shank of a 'key and hold the key against rotation, and means on the guard plate and the face plate for engagement with each other to hold the guard plate in engagement with the key shank.

2. The combinition with a face plate for a door lock or the like, said plate having a key hole, of a bolt slidable on one face of the plate for engagement with the spindle of the lock, to hold said spindle against rotation, a guard plate pivotally and slidably mounted on the face plate and connected to and movablewith the bolt, said guard plate being shittable laterally to position across or away from the keyhole, there being a slot in the guard plate to receive the angular portion of the shank or a key, a portion of said slot being positioned to receive said shank and hold the key against rotation when the guard plate and the bolt are slid relative to the face plate, and cooperating means on the face plate and guard plate for holding the guard plate against sliding movement out of engagement with the key shank and for holding the bolt against sliding inovemento'utot engage mom with the spindle.

3. The combination with a lock spindle having a bore extending there'tln'ough, of a face plate for attachn'ient to a ooor or the like through which the spindle projects, a bolt slidably mounted on the face plate, a guard plate pivotally connected to the bolt and slidably and pivotally mounted on the face plate, said guard plate having a slot for the reception of the angular portion of a key, the said guard plate being shiitable longitudinally to embrace the key shank and hold it against rotation and move the bolt into the bore in the spindle, and cooperating means on the guard plate and face plate for holding said guard plate and the bolt against sliding movement away from key and spindle engaging positions.

In testimony that claim the foregoing as my own, I have hereto al'fixcd my signature.

JAMES WILLIAM naasnnn. 

